| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 31,056 | 33,102 | 65,208 | |
| 2020 | R | 31,299 | 31,798 | 64,327 | |
| 2016 | R | 24,938 | 27,609 | 56,575 | |
| 2012 | D | 27,913 | 26,197 | 54,788 | |
| 2008 | D | 30,742 | 25,900 | 57,616 | |
| 2004 | R | 25,411 | 29,781 | 55,755 | |
| 2000 | R | 23,211 | 24,803 | 49,272 | |
| 1996 | R | 19,781 | 20,092 | 44,666 | |
| 1992 | R | 16,752 | 18,669 | 47,883 | |
| 1988 | R | 15,322 | 24,193 | 39,806 | |
| 1984 | R | 10,290 | 27,720 | 38,199 | |
| 1980 | R | 12,742 | 22,927 | 39,977 | |
| 1976 | R | 12,083 | 22,120 | 34,750 | |
| 1972 | R | 8,986 | 20,413 | 29,811 | |
| 1968 | R | 8,347 | 14,184 | 24,826 | |
| 1964 | D | 12,590 | 8,919 | 21,555 | |
| 1960 | R | 6,912 | 14,163 | 21,149 | |
| 1956 | R | 6,053 | 13,762 | 19,850 | |
| 1952 | R | 5,170 | 13,723 | 19,018 | |
| 1948 | R | 4,264 | 8,637 | 13,320 | |
| 1944 | R | 5,049 | 9,975 | 15,140 | |
| 1940 | R | 5,645 | 9,864 | 15,594 | |
| 1936 | D | 6,780 | 6,649 | 14,031 | |
| 1932 | D | 6,887 | 5,840 | 13,172 | |
| 1928 | R | 2,285 | 8,493 | 10,836 | |
| 1924 | R | 2,462 | 8,232 | 11,175 | |
| 1920 | R | 2,727 | 7,343 | 10,344 | |
| 1916 | R | 3,461 | 3,802 | 7,481 | |
| 1912 | D | 2,482 | 2,333 | 7,287 | |
| 1908 | R | 3,131 | 4,364 | 7,804 | |
| 1904 | R | 2,141 | 5,553 | 8,003 | |
| 1900 | R | 3,908 | 4,809 | 8,942 | |
| 1896 | D | 4,631 | 4,270 | 9,090 | |
| 1892 | R | 2,837 | 3,788 | 7,853 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Eaton County sits immediately west of Michigan's capital, blending suburban Lansing commuter communities with small agricultural towns—a mix that has compressed its once-reliably wide Republican margins to single digits in recent presidential cycles.
The Democratic margin in Eaton County has rarely exceeded seventeen points in modern history; the Republican margin has rarely exceeded fifty-seven points. 2024 delivered the county to the Republican candidate by three points.
Eaton County's demographics resemble the country more than they resemble most counties. A 81% non-Hispanic-white share, a 8% poverty rate, and a median household income of $79,597 — all within the broad national range. The county's voting pattern over the last decade is most similar to that of Essex County and Warren County.
